Radiotelegraph system



Dec 99 W. L. C'ARLSON ET AL.

RADIOTELEGRAPH SYSTEM Filed Jan! 14, 1920 H M i xN wm luvamkqg Wm 3 3% Willi" @M E Q 5 WE E m y M Y K R N K W spcciiicaticn,

, cw is i A m c 1.7.1. GAJRLSWN, AND EARL C. HAEZSUEL GEE W iis'smcccii, msmimi? Applicaticn filed. mum" iligi 0i C1 110W usefu graph System.

This inn 01. i'ciaies t0 the ieccisicu cf 1 radio or a and more particuizu'ly iio itiie'xe incorporating high RPGUL i012 may; i'eccption of signals over long Hcretofcre in order to z'cceive umiampcd long: waves ci fi'equeiicies, not suificicntiy Yuletc the average human can 1 in":

. zueiihcds having ue of the hetcrcciyuc principle. coicctcf cur invcnticn is arrangement for receiving minis transmitted from a m" (2% of this invcusiciq is to a, recording" tici iircc"iy by the receive 'icns without the use of E iii-Quit. The rc-oraiing apii that signals will be registered nigh speeds on a permanent eicmcuiz and ie'izci" reproduced at ccuveuiei" spccds cm? s rensiaticciw I @111 in eii'tioia, 'wiii cc appreciated by radio cugi en's, departs :ccziiceiiy from sy tems hcrcic-icre prcpcseai "fer ccnciuctiug couu'nci'cizil iongz distance mciic trafiic. The invcui'icn makes practical the continuous operation of iongz (iismuce ruiio stations on 'twcu y four hour schctiules. The 4 iust aftcd diagi-cinmati iy in one cf iis forms in the accompanying drawings, i'hereiu- Figure 1 shows a receiving circuit to be used for amplifying and recording the high speed long wave iclcgiaphic signals; and

Figure 2 shows: a circuit for reproducing a, lower speed and lower frequency, the signals recorded by the use cf the circuit (iiiscioscoi in Figure 1.

Referring puriicu'iariy to the diagram sic-own. in Figurc 1 reference character 1 Ms, M.

' gi'aphcne us invention reprcseucs antcims, ciccui;

incoming a: rudic frequency. mis CHfCulii is set-m; the definite frequency c-Z iiue iiaiisiuiiiing win e i'eziiaieifi fTfiiT'l the iruusiiiiitiug sfiw'zicn with. vauicii the receiv ing station designed kc msintain ccm ciai traffic. Associated with the antcrc Quit 3. isu resonant sec dary circ' (iefimteiy iuncd to the lce ucucy of 6 transmitting Wave. *Jmtmccted to circuit 2 is umuitista high er amplifier compvisiugihe theitiuioni 4 uum tubes 3. 5, 7 and 9, uuci tune-2i ruciic f cquency transformers -i, 8 and The radio frequency step-down mnsfmmei' 10 links the vacuum tube. ampiifici' circuit toihe carding apparatus The recording app-arm; i1 is shown in the form of the tciegmphuuc but it will be understood that "WP, (10 no; restrict ourseives to any specific recording device. The teim shown comprises ifihe "iaiking head 11, and ihc moving siccl wii'c 11 01% aerated by means cf the reel mechanism iniiicated at 11 The icicgmphcne is a kncwn uppzi'ruius zmii need m5 be 'fifificiibfi heieiu.

In the practicai operation of i is will be desiiubic in supply so that the operator in charge cf iusmay at iii times re-cciiiy cicterniue the system is functioning properly. T. coxnplisii :1 tciepinmc r000 '53? 1% is empioymi. The teiephcuc rccciv'c piimgms are iicciiauiczily iuzic fi to ccmicgr WHYG frequency,

In Figure 2 the reproducing lice the telegi'apimuc 11 is connected to inc input of an amplifier coliiprisim tuned midis frequency transformers 13 and and thermionic vacuum tubes 1-1; and 16" The output circuit of amplifier is vonnccicci to en audio frequency responsive device 17.

Tim operation 0'? the system 1s icimaintain i'adiotelcgi'ziphic communication at 100 words per minute over vast dlstsuccs.

The i'eceivin station to oncrate in c0tc unction with the abcvc (iGSCliiOQd trsnsmi L":

si'nzion wouid be equipped with a reccwizig circuls as harem {)QEBIQSBCL 'iluc circ its i'c station having an output of 52000 Figure}. are definitely tuned to 50,000

meters (6000 cycles) and. the telegraplione is operatedat a speed above that ordinarily employed in itscommercial use as a voice recording apparatus. The incoming signal is'rec'orded on the telegraphone at a speed .of 100 words per minute and at the frequency of 6000'cycles.

In the reproduction process as indicated in Figure 2 the telegraphone is operated at a speed one fourth that at which the. message was recorded. The result of lowering the speed. of the telegraphone in the reproduction process is twofold: First. the signal speed. is reduced from 100 to 25 words per minute; second. the signal frequency is reduced from 0000 cycles to 1500 cycles. The

audio frequency amplifying circuit of the reproducer is'tuned to 1500 cycles (200.000

meters) and amplifies the energy to actuate the telephone receiver 17. or other responsive device. The telephone receiver and the average human ear respond efliciently'to this frequency. While they respond very inefiiciently to the higher frequency. that is 6000 cycles at whichthe telegraphicsignals were initially recorded.

The invention upon which this application is based is hroadenthan the specific embodiment thereof which has been shown for the purpose of illustrating one of its uses, and we intend no limitations .ot'her 1 5 sms than those imposed by the appended claims. or by the art.

'lYha't we claim is 1. A radio receiving system comprising a wave responsive circuit tuned to the ire quency of incoming Sl EIIltllSpll plurality of electron tube amplification circuitscoir ,nected to said wave responsive circuit. an

nected to said wave responsive circuit. an'

output circuit connected to the last of said electron tuhc amplification circuits, a plurality of responsive devices connected in said output circuit. each comprising 'sets' of electromagnetic windings. a mechanicallytuned diaphragm actuated by one set of said windings and a magnetic record affected by the other set of said electroinagnc i:- vi'iadings.

EARL c. llAhSON. W NDaLLL. cARLsoN. 

